JDK1.7以上javaFTP上传删除文件

packagecom.itv.launcher.util;

importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileNotFoundException;
importjava.io.IOException;
importjava.net.InetSocketAddress;
importjava.util.Properties;
importjava.util.StringTokenizer;

importsun.net.TelnetOutputStream;
importsun.net.ftp.FtpClient;
importsun.net.ftp.FtpProtocolException;

/**
 * FTP上传工具类
 *
 * @author yanzhou
 * @version v1.0
 */
publicclassFTPUtil {

    privatestaticFtpClient ftpClient = null;
    privatestaticfinal String url;
    privatestaticfinal int port;
    privatestaticfinal String user;
    privatestaticfinal String password;
    privatestaticfinal String remoteFilePath;

    static{
        Properties FTPPro = ReadFTPProperties.getMsgFromPro();
        url = FTPPro.getProperty("FTP_URL");
        port = Integer.parseInt(FTPPro.getProperty("FTP_PORT"));
        user = FTPPro.getProperty("FTP_USER");
        password = FTPPro.getProperty("FTP_PASSWORD");
        remoteFilePath = FTPPro.getProperty("FTP_REMOTE_FILEPATH");

    }

    /**
     * 链接FTP
     * @throws FtpProtocolException
     */
    privatestaticvoid connectFTP() throwsFtpProtocolException {
        try{
            ftpClient = FtpClient.create();
            ftpClient.connect(newInetSocketAddress(url, port));
            ftpClient.login(user, password.toCharArray());
            ftpClient.setBinaryType();
            if(!"".equals(remoteFilePath) && remoteFilePath != null) {
                ftpClient.changeDirectory(remoteFilePath);
            }
        }catch(IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 关闭FTP链接
     */
    publicstaticvoid closeFTP() {
        try{
            if(ftpClient != null) {
                ftpClient.close();
            }
        }catch(IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 上传文件到FTP
     * @param file file文件，struts2从页面得到的File类型
     * @param filePath 要保存在FTP上的路径（文件夹）
     * @param fileName 文件名（test001.jpg）
     * @return 文件是否上传成功
     * @throws Exception
     */
    publicstaticboolean upload(File file, String filePath, String fileName) {
        TelnetOutputStream to = null;
        FileInputStream fi = null;
        filePath = remoteFilePath + Constants.FILE_SEPARATOR + filePath;
        try{
            if(file != null) {
                connectFTP();
                if(!isDirExist(filePath.replace("\\","/"))) {
                    createDir(filePath.replace("\\","/"));
                    ftpClient.changeDirectory(filePath.replace("\\","/"));
                }
                fi = newFileInputStream(file);
                to = (TelnetOutputStream) ftpClient.putFileStream(fileName, true);
                byte[] bytes = newbyte[1024];
                inti = fi.read(bytes);
                while(i != -1) {
                    to.write(bytes);
                    i = fi.read(bytes);
                }
            }
            returntrue;
        }catch(FileNotFoundException e1) {
            returnfalse;
        }catch(IOException e2) {
            returnfalse;
        }catch(Exception e) {
            returnfalse;
        }finally{
            if(fi != null) {
                try{
                    fi.close();
                }catch(IOException e) {
                    e.printStackTrace();
                }
            }
            if(to != null) {
                try{
                    to.flush();
                    to.close();
                }catch(IOException e) {
                    e.printStackTrace();
                }
            }
            closeFTP();
        }
    }

    /**
     * 删除FTP制定目录下的文件
     * @param filePath 文件在FTP存储的路径
     * @param fileName 要删除的文件名称
     * @return 是否删除成功
     */
    publicstaticboolean deleteFileFtp(String filePath, String fileName){
        try{
            connectFTP();
            filePath = remoteFilePath + Constants.FILE_SEPARATOR + filePath + Constants.FILE_SEPARATOR;
            if(!isDirExist(filePath.replace("\\","/"))) {
                returnfalse;
            }
            ftpClient.changeDirectory(filePath.replace("\\","/"));
            ftpClient.deleteFile(fileName);
            returntrue;
        }catch(Exception e) {
            e.printStackTrace();
            returnfalse;
        }finally{
            closeFTP();
        }
    }
    /**
     * 检查文件夹是否存在
     *
     * @param dir
     * @param ftpClient
     * @return
     */
    privatestaticBoolean isDirExist(String dir) {
        try{
            ftpClient.changeDirectory(dir);
        }catch(Exception e) {
            returnfalse;
        }
        returntrue;
    }

    /**
     * 创建文件夹
     *
     * @param dir
     * @param ftpClient
     * @throws Exception
     */
    privatestaticvoid createDir(String dir) throwsException {
        ftpClient.setAsciiType();
        StringTokenizer s = newStringTokenizer(dir,"/");// sign
        s.countTokens();
        String pathName = "";
        while(s.hasMoreElements()) {
            pathName = pathName + "/"+ (String) s.nextElement();
            try{
                ftpClient.makeDirectory(pathName);
            }catch(Exception e) {
                e = null;
            }
        }
        ftpClient.setBinaryType();

    }

}

2. [代码]常量类，系统的路径分隔符     

packagecom.itv.launcher.util;

publicinterfaceConstants {

    //路径分隔符
    publicstaticString FILE_SEPARATOR = System.getProperty("file.separator");
}

3. [代码]FTP链接的配置properties文件，包括用户名密码一些信息     

#FTP的IP地址
FTP_URL=127.0.0.1
#FTP端口号
FTP_PORT=1234
#用户名
FTP_USER=yanzhou
#密码
FTP_PASSWORD=abcdefg12345
#FTP账号目录
FTP_REMOTE_FILEPATH=